[Hadean]

Maybe the first one didn't give him a good angle or had other obstruction.

That's what I thought initially, but it's a window. Shouldn't be too hard to be able to determine that before breaking it, no?

[roadcat]

Many accounts from law enforcement and those in the crowd, say that he first opened fire near the stage causing panicked attendees to run away towards the exit. He then shifted fire to the 2nd window at a different angle and shot at those near the exit. One gunman, two angles.